1 0 Kinematics PPGuided Notesx

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14 Νοε 2013 (πριν από 3 χρόνια και 7 μήνες)

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Unit 2
-
Kinematics




Kinematics
-
What is it?

Kinematics

________________________________


_____________

is always defined in terms of change in
_______________.


Locations or Positions are defined in terms of some
_________________________.


Many ti
m
e
s we use our
____________________________

to define F/R.


Scalars and Vectors

When discussing kinematics, and truly, all aspects of physics, we will be using two
different types of measurements

Scalar Quantity:


The Price is $12.00 is a scalar.


Vectors
Quantity:


The price
Increased

by $12.00 is a Vector.


Vectors

As stated, a vector is a
_____________

(How big or How much) with a
_____________
.


Ofte
n we will
draw vectors as ________________

pointing in the direction of the
vector.


We can add vectors (
_________________
):

Algebraically by placing the vectors
___________________

and then finding
the algebraic sum


or Graphically.

(_________________)


Distance

is a Scalar

_______________

and
_________________

seem very similar, but they actually
have distinct meanings.


Unit 2
-
Kinematics




___________________

is a scalar quantity which refers to how
__________

a body
______________

in going from
_____________________________.


Example:
12 m is a
_______________
…it tells how far.


Displacement is a Vector

____________________

(generally written as….
Δ
x or
Δ
y…..is a
____________

_____________

which refers to the
_________________________________

________________________
________
. Direction can be given in a lot of ways,
by compass
directions (N, S, E, W) or by ___or

___
sign along the

x (
______________
) or y (
_________________
) axis.


Example #1

A student walks 100 m to the East and then walks 300 m to the West.

What is the
student’s total distance traveled?

At the end of her walk, what is her total displacement?


Example #2

A student walks 4 m east, 2 m south, 4 m west, and finally 2 m north.

What is the students total distance? Displacement?


Example #3

A family travels

50 km south on I
-
75 and then gets off on exit 117 and follows a dirt
road 15 km east.

What is the families total distance traveled?

At the end of their trip, what is their total displacement?


Speed & Velocity

Speed



______________________________


Velocity



_____________________________



Calculating Speed

In order to find the average speed or average
___________________

of an
objects velocity
________________________

it has traveled by the
___________

it took to travel that distance.


Speed =
_______/___________ Or _____________


Unit 2
-
Kinematics




Defining and Calculating Velocity

We can look at and
______________
in a couple of ways

Instantaneous velocity






Average velocity
-


Calculating Velocity

Velocity is



It’s important to remember that
__________________

has
_________________!



Practice

What is the velocity of a car that travels 75 km towards Richmond in 5/6 hour
(give answer in km/hr and m/s)



What is the speed of a person who runs 10 km in 1.5 hours (answer in km/hr and
m/s)


Accel
eration

Acceleration
is the measure of how

___________________________________________________________.


Formulas for acceleration (or change in velocity):




More Acceleration

Acceleration is a measure of how
________________________

during a particular
length of time. Remember! Vectors not only tell How Big a Quantity is, but also in
___________________________________________!



So, a body may travel at a constant speed, but
____________________________
,
it is
______________________
________
!!!



Unit 2
-
Kinematics




Centripetal Acceleration



An object moving in a circle is accelerating because

it’s
___________________
is
changing even if it’s
__________________

is remaining constant


Acceleration is a VECTOR

This means that Acceleration has a
______________________(
______________

______________________________________)


It also tells us in what
____________________

that
______________________

takes place.


This is normally done with
______ or _____
signs.

+ means to the
_____________ or _______
____.

-

means to the
_____________ or ___________.



More Acceleration

So by convention, if an object is
____________________
, and the acceleration
(speeding up) is in the same direction as the velocity. This gives the object a
______________
__________________.


If an object is
_____________________
, and the acceleration (slowing down) is in
the opposite direction of the velocity. This gives the object a
_________________
______________________
.


Examples of acceleration

Give some examples of positive acceleration


Give some examples of negative acceleration


Name four controls in a car that can cause an acceleration

1.

2.

3.

4.





Unit 2
-
Kinematics




Calculating acceleration

To find acceleration, we divide the
___________________________

by the
___________
it takes for that change (rate of change of velocity)
.


Acceleration =



Practice Problems

A vehicle initially traveling westward at 35 km/hr and comes to a stop in 15 s. What

is the magnitude and direction of the acceleration of the
vehicle?




A rock is dropped from the top of a cliff and after 10 seconds is traveling 40 m/s.
What is the magnitude and direction of the rock’s acceleration?